Not a question this time, but simply to state how impressed I am with how easy it is to connect to a Samba share on a machine running Raspbian. I really was expecting a bit of a struggle with this (using one operating system to connect to a server running another operating system using a protocol developed by someone else entirely) but it really couldn't have been easier. Start !omni from the Apps folder, enter the workgroup, user and password, and that's it. Brilliant.
Thanks to everyone who has helped put RISCOS on the pi. It's a perfect match.